Ok not sure which one you need but here are measurements for the two types of bolts that hold the motor in the car.
First is the one that bolts the motor mount to the block. They measure 7/16-14 x 1 3/4". They also use a lock washer.
Second is the bigger bolt that goes through the frame pad into the mount itself. They measure 1/2-20 x 1 1/8"
Defiately use grade 8. Also with the 1/2" bolt is a heavy thick washer. Make sure you have that also. Most hardware stores may not have the 1 1/8" bolt. But a good nut and bolt store will.
Hope this helps.
ps - these measurements came from the parts manual.
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67 Firebird Convert 455 +.060 TH400 74cc KRE d-ports piston dished 16cc H-beam rods Comp Cam 305-AH-8 cam 108* LSA 253/260 @.050 duration .577/.594 lift w/1.65 rockers Ford 9" 3.50 Detroit Locker M/T Sportsman Radials 31x18x15 on Convo Pro 15x15s
Last edited by 67 455 Bird ragtop; 06-13-2006 at 03:44 PM.
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